Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO
We present a long time series (1992-2001) of bottom temperature from 1040m on the continental slope north of Elephant Island, Antarctic Peninsula. A strong annual signal is apparent, with minimum temperatures during or following the austral winter, and a range similar to that found in much shallower...
Published in: | Geophysical Research Letters |
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Online Access: | http://hdl.handle.net/1834/17112 https://doi.org/10.1029/2003GL017074 |
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ftoceandocs:oai:aquadocs.org:1834/17112 2024-06-09T07:39:54+00:00 Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO Meredith, M. 2003 pp.1462 http://hdl.handle.net/1834/17112 https://doi.org/10.1029/2003GL017074 en eng https://doi.org/10.1029/2003GL017074 http://hdl.handle.net/1834/17112 Journal Contribution Refereed 2003 ftoceandocs https://doi.org/10.1029/2003GL017074 2024-05-15T08:02:16Z We present a long time series (1992-2001) of bottom temperature from 1040m on the continental slope north of Elephant Island, Antarctic Peninsula. A strong annual signal is apparent, with minimum temperatures during or following the austral winter, and a range similar to that found in much shallower waters on the adjacent shelf. Individual convective events are observable as large-amplitude cold spikes that are confined to the period of seasonally coldest temperatures. These plumes are dense enough to seasonally displace the Circumpolar Deep Water, and directly inject cold water into the deep open ocean. The coldest water occurred when anomalous sea ice conditions were prevalent, caused by the strong 1997/98 ENSO event. We thus expect repeats of such strong convective events on ENSO timescales. The observed long-term warming and reduction in sea ice along the Peninsula may, however, act to suppress this mode of ventilating the deep Southern Ocean. Published Book Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Sea ice Southern Ocean IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Antarctic Antarctic Peninsula Austral Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Southern Ocean Geophysical Research Letters 30 9 |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
description |
We present a long time series (1992-2001) of bottom temperature from 1040m on the continental slope north of Elephant Island, Antarctic Peninsula. A strong annual signal is apparent, with minimum temperatures during or following the austral winter, and a range similar to that found in much shallower waters on the adjacent shelf. Individual convective events are observable as large-amplitude cold spikes that are confined to the period of seasonally coldest temperatures. These plumes are dense enough to seasonally displace the Circumpolar Deep Water, and directly inject cold water into the deep open ocean. The coldest water occurred when anomalous sea ice conditions were prevalent, caused by the strong 1997/98 ENSO event. We thus expect repeats of such strong convective events on ENSO timescales. The observed long-term warming and reduction in sea ice along the Peninsula may, however, act to suppress this mode of ventilating the deep Southern Ocean. Published |
format |
Book |
author |
Meredith, M. |
spellingShingle |
Meredith, M. Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
author_facet |
Meredith, M. |
author_sort |
Meredith, M. |
title |
Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
title_short |
Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
title_full |
Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
title_fullStr |
Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
title_full_unstemmed |
Downslope convection north of Elephant Island, Antarctica: Influence on deep waters and dependence on ENSO |
title_sort |
downslope convection north of elephant island, antarctica: influence on deep waters and dependence on enso |
publishDate |
2003 |
url |
http://hdl.handle.net/1834/17112 https://doi.org/10.1029/2003GL017074 |
long_lat |
ENVELOPE(-55.184,-55.184,-61.085,-61.085) |
geographic |
Antarctic Antarctic Peninsula Austral Elephant Island Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Austral Elephant Island Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Sea ice Southern Ocean |
op_relation |
https://doi.org/10.1029/2003GL017074 http://hdl.handle.net/1834/17112 |
op_doi |
https://doi.org/10.1029/2003GL017074 |
container_title |
Geophysical Research Letters |
container_volume |
30 |
container_issue |
9 |
_version_ |
1801382898058657792 |